ifstream not opening filename from getopenfilename - c++

Question

Amateur programmer here. My problem today is that I am trying to load a .txt file in to be displayed in the edit box of a dialog box.
before I start with code: I can get it to work by SPECIFYING the file location and bypassing the load dialog from getopenfilename, and it works swimmingly. But when i obtain that file location from getopenfilename, i can't seem to work it.
The relevant code is:
ZeroMemory(&ofn, sizeof(ofn));
ofn.lStructSize = sizeof(ofn);
ofn.hwndOwner = hDlg;
ofn.lpstrFile = szFile;
ofn.lpstrFile[0] = '\0';
ofn.nMaxFile = sizeof(szFile);
ofn.lpstrFilter = "All\0*.*\0Text\0*.TXT\0";
ofn.nFilterIndex = 1;
ofn.lpstrFileTitle = NULL;
ofn.nMaxFileTitle = 0;
ofn.lpstrInitialDir = NULL;
ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
if (GetOpenFileName(&ofn) == TRUE)
{
hf = CreateFile(ofn.lpstrFile, GENERIC_READ, 0, LPSECURITY_ATTRIBUTES)NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, (HANDLE)NULL);
ifstream inFile(ofn.lpstrFile);
if (!inFile)
MessageBox(0, "CAN'T OPEN FILE", "ALERT", MB_OK | MB_ICONWARNING);
else
{
string text;
while(getline(inFile, text));
inFile.close();
MessageBox(0, text.c_str(), "msg", MB_OK);
SetWindowText(editbox, text.c_str());
}
CloseHandle(hf);
hf = INVALID_HANDLE_VALUE;
I am a novice, but I have been wracking my brain and my google bar trying to figure this out.
It does not ever open via fstream.

Answer 1

The source of the problem is that you try to open the file with both Win32 API (CreateFile()) and with standard library (std::ifstream).
By looking at your CreateFile() call and at the documentation, one can see that you are passing 0 to the dwShareMode argument, whose description states:
If this parameter is zero and CreateFile succeeds, the file or device cannot be shared and cannot be opened again until the handle to the file or device is closed.
But, after that call, you proceed to try to open the file via std::ifstream, which fails due to the reason described above, and you are only checking if ifstream succeeds to open the file.
The issue can be avoided if you use only either CreateFile() or std::ifstream, not both.